Slide rule



Mach 31. -1925. Y F.A WMPNER sm'mi nme Filed prl "90',f 1923 Fig. 3

Patent-ed lider., 3l, w25,

Feira wor-arisen, or ennornsorun, ev

or senin, nnen nur nii een fro @nn einer ennnnnv.

A. il-iT. ELBER,

Application filed april $28, 1923. Serial No.

To @ZZ whom t may concern:

Be it known that l, FRITZ WMrNnn, a

citizen ot the German Reich, residing at Geroldsgrun, Germany, have invented certain new and useful li'nproveinents in Slide ltules (tor which l have liled an application for patent in Germany on the 20th ot April, 1922), ot which he following is a specification. y

lt has already been proposed to avoid the deformations or the slide rules due to influences ot the weather9 and tie inconveni-A ences resulting` trom the same, by giving` a special shape to the body ot the slide rule. lt has tor instance been proposed to subdivide into two parts in longitudinal direction the body of the rule which serves as guide 'for the slide7 said parts being` connected by springs. This improvement of the construction ol' the slide rule is however not an absolutely satisfactory solution of the problem as7 besides the springs, guiding elei'nents are provided which ensure the correct mutual position of the parts of the rulebody. But even it such guiding elements are used the parts ot the rule-body are liable to assume an inclined position it the slide is pulled out partly and even more so if it is pulled out ahnost completely. The tension of the springs varies further il the shape ot the rule-body is altered so that the cheeks of the rule-body are not constantly pressed against the vslide at the saine pressure.

According to another forni of construetion the bottom plate ot' the rule-body has incisions in longitudinal direction designed to produce elasticity in transverse direction. The mutual distance of the two cheeks ot the body is adjusted by means of adjusting screws with adjusting nuts. rlhis torni ot construction permits a mechanical adjusting of the two cheeks the one with regard to the other but it does not ensure an elastic pressure ot the saine against the slide. lWith this construction'no uniform sliding of the slide in the yinlefbody is thereiiore ensureda so that, besides the adjusting; sere-ws, a blade 'spring` has to be used which bridges over the entire bottoni o' the rule-body and serves tor pressing the two cheeks the one against the other. This form ot construction pre- 'sente however the inconvenience that the tension oi the spring will be altered it the adjusting` screws are tightened or loosened, the friction between the cheeks and the slide 1 'n rw. ilwS -ul its object the i solution oi' the problem which is with the aid ot the well known. lamelles oi" band steel bridging over a longitudinal slot which divides the rule-body into two parte. The lamellen of steel band are lined, aecordiing` 'te invention7 in one of the parts otl the bodyonly, their other ends bein g mounted with the aid ol guiding cylinders constructed like nuts in the other part of the body so that they may be displaced in longitudinal direction and they may be adjusted by ineens oit' screws which are mounted revolubly in this part of the rule-body but so that they cannot be displaced in the saine.

@wing to this arrangement a uniform sliding of the slide in the rule-body is ensurcda independently of the alteration of shape ot the rule body produced by the influences ot' the weather. rlhis form ot construction is i'-urther inuch simpler than the known Aiornis ot construction as, besides these lamelles oiband steel no special guiding; elements nor adjusting screws are requirecb the lainellee being` constructed so that they serve at the saine tinie as guiding ineens and as adjusting means.

@n the drawing' an embodiment of the invention is shown by way of example.

llig. l shows the slide rule in plan view.

Fig. 2 is a cross sectionfand 3 is a longitudinal section on line iii-B of Fig. 2.

rlhe slide rule consists in the well known inanner ot the bottoin plate l and the two side cheeks 3, i and of the slide which is not shown on the drawing. rlhe rule-body is subdivided into two parts la, lb by a longitudinal slot. ln the one part la the laniellze 5 ot band steel, known per se, are embedded and fixed by ineens of screws or the like. rl`he lainellee 5 comprise each a guide cylinder (5 constructed lilre nut and designed to be inserted into corresponding, transverse boi-ings et the other part lb of the rulebody. ln this part lb screw bolts S with heads are inserted at convenient points. t displacement ot the screw heads 7 in longitudinal direction is prevented by the pins driven trein below upward through the Circular The seiew hezida4 ere eoneeqiientiy always i'iush with the outer edge of jhe ride-body.

it evident` that the distance between ihe two pnite of the iii]e-body may be filtered by tunning 'the Anis aS they are not niovable in lenffitudinzil direction, me guide pins and the iii-.meme of bund 'steel fixed on the saine being inoiinied in he pai-t lb of *che mile-body so that they cannot rotate but move in this pmt. The tension of the springs 'iy Whie'ii the cheeksI of the ruleA` body pressed elegeinst the slide is; ai\\" the saine :it any disinee between the two parte; of the ride-body- Thifs diszlnee can be mijueeii according to the dimensions which the pziits of the miie-body aiseiime :ieeei'ding io the actual .conditions of weather and tempera-ture.

The lziineilze of band steel .Coul-d ozu-'ry eerew bolts infsteiid 0i' die guide cylinders in which case the heads 7 ought to be consiucted like nuts.

'l claiinzm A slide rule comprising in combination zi rule-body divided into two parte by a loni'iiidiiial slet, imneile ei band steel einbedded and fixed in one of said parte of the ride body, guide cylinders acting like nuts pi'oieeting;` from the ends of said limieilze :ind engaging with the othei` part of the ride body :ind screws Iixed in said other' part of the rule body so that they can ifotee buiA nei move in iongiudiniil diieetion and erg` 1g; with said guide eylindez's io adjust the width of the gzip between Seid parte of the rule body.

in i'es-iinony whereof l ziiix niy signature iii presence of two witnesees.

ilTZ YVOLPN ER. Vx/Titnesses famili-ii liiiigrioiiii, ALEXANDER DE SOTO. 

